{"id":"cloudtrail-lake-orc-columnar-format","text":"CloudTrail Lake converts events from row-based JSON to Apache ORC columnar format for optimized storage and retrieval (not Parquet, not JSON at rest).","truth_value":"IN","source":"entries/2026/03/12/awscloudtrail-latest-userguide-cloudtrail-lakehtml.md","source_url":"","source_hash":"998a1b79e8c710ff","justifications":[],"dependents":[],"metadata":{},"explanation":{"steps":[{"node":"cloudtrail-lake-orc-columnar-format","truth_value":"IN","reason":"premise"}]}}